APPARATUS FOR CONTROLLING SUPPLYING OF REDUCING AGENT IN SELECTIVE CATALYTIC REDUCTION SYSTEM

摘要

The present invention relates to an apparatus for controlling a supply amount of a reducing agent in an SCR system which can optimize the supply amount of the reducing agent using characteristics of a zirconia (ZrO_2) sensor measuring an amount of nitrogen oxide (NO_x). The apparatus for controlling the supply amount of a reducing agent in an SCR system according to the present invention comprises: an SCR reactor providing a space in which reducing reaction of the nitrogen oxide is processed by the reducing agent; a reducing agent supply device supplying the reducing agent to the SCR reactor; a nitrogen oxide detection sensor detecting an amount of the nitrogen oxide (NO_x) contained in exhaust gas discharged from the SCR reactor; and a control unit checking a nitrogen oxide change according to the supply amount of the reducing agent based on information on the supply amount of the reducing agent supplied to the SCR reactor by the reducing agent supply device and nitrogen oxide detection information measured by the nitrogen oxide detection sensor, and if the nitrogen oxide is increased until a second point after a first point of the supply amount of the reducing agent, recognizing the first point as an inflection point to control the supply amount of the reducing agent, supplied by the reducing agent supply device, to be the supply amount of the reducing agent at the first point.